Method and means for cooling packing of hot-oil pumps



April M, 1931. 1.. c. HUFF 1,800,833

METHOD AND MEANS FOR COOLING PACKING OF HOT OIL PUMPS Filed Aug. 20, 1925 2 Sheets-Sheet l M271 2 1972 to 7 Z i -m Huff;

April 1931- L. c. HUFF 1,800,833

METHOD AND MEANS FOR COOLING PACKING OF HOT OIL PUMPS Filed Aug. 20 1925 2 Sheets-Sheet 2 @772072 G l/2725f)? Patented Apr. 14, 1931 UNITED STATES- PATENT OFFICE LYMAN c. nurr, (IF-CHICAGO, ILLINOIS, Ass GNoR-To UNIVERSAL '11 :Pnonuozrs com PANY, or CHICAGO, rumors, A CORIEORATION or SOUTH DAKOTA I METHQD AND MEANS FOR COOLING PACKING-Q33 HOT-OIL PUMPS Application .filed August 20,1;125.v serial u 51,525.

This invention relates to the idea of cooling 1 .the packing glandof a hot oil pump, and

rcfersmore particularly to the idea of ,so regulating the pressure on the cooling oil 5 that it can be, automatically adjusted by both 'oil discharged from the pump.

the suction and discharge stroke of the pump, thus maintaining a substantially balanced pressure across the inner gland'of the pump and preventing excessive leakage either way 10 and also eliminating severe --temperature strains. I n

One of the present comm-ercialmethods of cooling the piston rod and stufling'box ofa hot oil pump. is to circulate cooling. oil by means of an extra pump through an enclosure aroundthe piston rod at a pressure e'qual'to or greater than the pressure existing on the hot Where 'a pump is operating with a larger pressure increase across the pump, say, for illustration, 100 pounds in a two hundred .pound pressure system, thus making three sure drop across the inner gland j would be A three hundred and ten pounds minus two hundred pounds or one hundred and ten pounds instead of ten pounds as on the discharge stroke. This high pressure difference causes a large quantity of cool oil to leak into the pump cylinder, setting up temperature strains which tend to open the joints.

The present invention overcomes these various objections and has many other advan tages which will be apparent to those skilled. in the art. The present invention may be operated by withdrawing a portion of the hot oil discharged from the pump, cooling it' and using it as the cooling oil by introducing same to the chamber surrounding the piston rod of the hot oil pump, using the difference in pressure between the discharge and suction of the pumpfto cause the cooling oil to flow from the discharge of the hot oil pump through the cooling coil, through the chamber surrounding the piston rod into the suction of the pump. .The present invention Qwill substantially eliminate the necessity of pumping coolin 011 against a'higher pressure to balance t hat in the discharge of the pump, as well as reduce leakage across the inner packing gland and consequential pressure strains which tend to 'loosen joints and connections.

In the drawings:

Fig. '1 is a diagrammatic layout partly in vertlcal section of a device suitablefor carrymg out the present invention.

Fig. 2 is a vertical cross sectional view of a modified. form of construction.

Referring in'detail to the drawings, 1 des- I ignates the hot oil pump cylinder which ,has

the inlet 2 and outlet 3. The inlet 2 com-I .municates with the channel l and valves 5,

said channel 4 dischargingthrough com-. municatingapertures 6 into. the interior hollow chamber 7. of the cylinder 1. There'are similar communicating apertures '8' and valves 9, communicating with" channel 10, which latter channel communicates with thedischarge 3; It is tobe noted that the valves 5 in-the suction line to the pump seat against the direction of fluid'pressure, and are so arranged that they open on the) suction stroke. The valves 9 in the discharge communications are closed on the suctionstroke;

and open on the discharge stroke. This is more-or less standard equipment and need not be further described. Removable nuts,

11 are provided adjacent the valves9 for the purpose of inserting new valves or repairing the valve seats.

' A piston 12 connected to piston rod 13 is other end of the pump there maybe remoyi -x ably mounted a hollow chamber 16 connected to the pump cylinder 1 by means of the screw 7 bolts 1 The opposite end or this latter: It

chamber may be provided with closure plate 18, connectedto the chamber 16 hymeans of screw bolts 19 orthelike. ,In the closed gland'nut 21, which latterisoonnecfed to the casing of the cylinder 1 by' nieans of the-screw bolts 22. Gland nutj24 may be positioned at screw-bolts 25.

Describing now the means for introducing cold oil to the chamber 16, the pump 26 may."

draw cooling oil from anysource through the line 27 and into the line 28; controlled by throttle valve 29. The line 28 transfers the oil intothe line 30, andthence' into line 31,- controlled by; valve 32.- The oil passes through the line 31. and into the short con-j nectingpipe 33, in whic is mounted the check valve 34- and. throttle valve 35. r The oilis.

introduced into the interior of the chamber 16 entirelys'urrounding the piston rod- 13.

The pump 26 maybe the pump which charges.

intoanauxilliary piston chamber 4O, which is p rovided with removable heads 41 and 42,

is adapted to reciprocate horizontally in'said piston chamber. The oil passes out ofsaid piston chamber through either 'offtheg-lines 48 into the line 49. The oil maybefdiv'erted 'intoithe line 50 by opening valve 51, and clos-.' ing valve 52, in line 53, or valve]51 ;mav; be

closed 'and valve 52 opened, thus-diverting the oil into theline 53', which line 53 eventually merges with line 36, thus introducing a the oil to the dephlegmator orother heating means: In -case the oil is diverted through the pipe 50; it may be introduced into the line 2, which isthe charging line for the hot oilpump'.

As a feature of, the present invention it may be found desirable, due to theme that the charging oil used for'cooling purpose may be dirty or unfit to use as cooling oil. to divert a certain portion of the hot oil discharged through thepump discharge 3 into the line 54, controlled'by valve 55, in which line-54 may beinterposed. the cooling coil 56 mounted in box 57.. This .coolsthehot oil down to the point where itfmay be utilized tothe best advantage and discharges same through line 58, controlled by valve 59, which line 58 communicates with the cooling oil inlet pipe 33. Fixedly mounted on the piss ton rod betweenthe end onwhiclr the piston end of the pump cylinder. 1 and surrounding, the piston rod 13 may be positioned the flex-= ible packing 20, held 111 place by means of the:

the outer end of the closed plate 18 for cylin- -der 16. if. desired, being held place by the the latter being providedw'ith the packing" 43. gland nut 44,-held inplaoebyI screwbolts- 45.. 1A piston 46 mounted on piston rod 47 12 is mounted, and the steam cylinder of the pump, is an upwardly rojecting bracket 60. The upper end of this racket 60 is adapted to contact the lower endsof' pivotally mounted arms 61 01 62. These arms. 61 and 62 are pivotedat 63' on the supporting bracket 64'. The up er ends of these arms ""61 and 62 are adapte to contact lugs 63 and '64, respectively, finedlyattached to the piston rod .47.". The purpose of this arrangement will be hereinafter described.

As anillustration of one'method of operation, cooling oil may be .taken'from vany source of supply and introduced through lines 27', 28, 30, 31 and 33, into the interior of the chamber 16, flowing through the check valve 34, the valves 29, 32 and 35 being opened, and valves 37 and 59 c1osed.- On the forward stroke of the piston 12,-the cooling oil flows unobstructed through the chamber 16, andout through line 38 into the interior of the piston chamber 40. From this piston .chamber40 it' passes out through either of the lines 48 and ntoline 49. From line 49 it may be' diverted throu h lines 50 or 53, as desired, and 'as-hereto ore described. Ifit is diverted through the line 50, it will be introduced into the hot oil-pump chamber through line 2, forming part of the sfeed going into the system, On this forward stroke the"pres-.

sure onhthe oil in the chamber;16 is only slightly greater than the pressure in the suction: to the v hot oilpump. -f Consequently there isvery' little leakage of cooling oil through the inner stufling" box arangement 20 an'd21. into'thatfartof the pump cylinder which is filling wit hot oil from the suction line. Just before the piston 12 reaches the.

end of the forward stroke, the 4 jecting arnr 60- on'the piston r 13, contacts the lower end of the pivoted ,arm 61, which gpwardly procauses said am; 61 to rock on its pivot, the

upper end thereofjcontact'ing the lug 63 which causes the piston'rod 47 to be pulled outwardly, and the piston 46 to close the outlet from th'eflpipe 38, thus stopping-the flow of (:00

oil

The cooling oil is therefore trapped in chamber 16, asit cannot flow back intothe line 33 on account of'the check valve 34, at 'a rough the cooling chamber 16.

time when the piston is on the return stroke and a higherpressure is built upon the oil because of the slight leakage of hot oil through the innerjstufiing box arrangement 2O- and 21. This entrapped oil thereforepre-j vents excessive leakage of hot oil through said stufling box arrangement 20 and 21, and

at the same timeabsorbs the heat from the hot piston rod 13, thereby cooling it'before the hot surface of the rod comes in contact with the outer packing 23 and 24.

The pressure-on both sides of the inner stufling box arrangement is therefore substantially balanced on the return stroke of the pump when the piston is forcing the. oil

V of the oil going through the various lines out of the end of the cylinder adjacent to the cooling chamber 16 against whatever.

13 plained. This permits the oil in cooling chamber 16 tobe Withdrawn and replaced with fresh, cool oil. This cycle of operation is continuously repeated, the amount of coolin oil being regulated by valves 32 and 35.

TVhen the oil in the cooling chamber 16 is diverted through the line 50 into the line 2', there is only a slight differ ence in pressure between chamber 16 and the cylinder 7 of the pump. The pressure difierence across the inner stuffing box arrangement 20 and 21 therefore will be only. equivalent to friction which would cause no appreciable leakage of cooling oil into the pump cylinder 7 tlliroigh the inner stufiing box and packing gan s.

When the cooling oil from line 48 is diverted into line 53, the ressure difierence across the inner stufiing ox and packing gland would be somewhat higher due to the head of cool oil in the line 53. This would be partly offset bywhatever liquid head there was on the suction to the hot oil pump aside from the system pressure.

' It is to be understood that the invention is applicable to any type of pump, including Duplex pumps. In its application to Duplex hot oil pumps, the piston 46 is so arranged that it also controls the outflow of oil from the cooling chambersonboth pistons. The

may be'opened might be taken from the discharge line 3, r through line 54, and cooled before being heated. The pressure in the discharge line being higher than in the suction line would cause oil to flow through the cooling coil into the chamber 16 andinto the suction line of the ump.

the present invention, I have provided a means for regulating the fiow of cooling oil through acooling gland or through a stufling box orother arrangement on a hot oil pump, and regulatin the pressure thereon while in the cooling 0 amber, so as to more nearly connection 65 is provided for the other cylin-- T erefore it will be seen that according to balance the pressures across the'inner stuffing box or similar arrangement, regardless of whether the pump piston is taking suction or discharging liquid. Thus I reduce to a minimum the leakage or flow of either hotor 0001 oil through the inner stuffing box, thus eliminating severe temperature changes in the metal parts of the apparatus, particularly the joint. Where the coollng chamber is fastened on the pump cylinders.

This invention also'contemplates the withdrawalof a portion of-thehot oil being discharged through the line 3, and after cooling it using same for coolin the piston rodand stufling boxes. This oi may be then discharged into the line 2 of the pump. The arrangement ust described provides a supply of clean cooling oil, usin the difierencein pressure between the disc arge of the pump and the suction to cause said oil 'to' flowthrough the cooling chamber in. regulated quantlties.

Referring in Fig. 2, t

now to the modified view shown e oil may be introduced through the line 33, controlled by valve 32', and check valve 34, into the interior of the cooling chamber 16'. The coolin chamber 16 at'its outer end may be provide with a closure cap I 24, held in place by the screw bolts 25', and adjacent the; closure cap line 3', channel 10 valves 8, communicating ducts 9', and-removable ca 's 11'. Piston 12 is adaptedto reciprocate orizontally in the chamber, being connected to the piston rod 13. The coohn oil introduced into the 'inte rior. of the charm er 16' may circulate around the piston rod 13' imthe same manner as heretofore described, but instead of being re: turned to the suction side of the u'mp'or sent to' the dephlegmator or other eatlng me- .dium, it may be discharged through the line 66 into the duct 67 which introduces it into theinter'ior 7 of the pum cylinder 1. A check valve 68 is interpose .in the connection between the lines 38 and 66, forthe purpose of allowing the oil to fiow into the line 66 but reventing the oil from flowing backward into the lines 38. The piston rod 13 may be connected to a steam cylinder of any kind.

An annular "perforated packing retainer 69 may be inserted between the outer packing '23, and the inner packing 20' for the purposeof securing maximum benefit from the packing material and allowing for readily adjust,-- ing the tightness of said packing. In other words, if the closure cap 24 is forced'inward- I ly, the packing 23' will give slightly, but willalso cause thepacking retaining member 69 to be forced inwardly, thus tightening the packing 20." The operation of this device will be instantly apparent. The cooling oil will be alternately discharged into the pump. cylinder through the line 66-on the suction stroke of said pump on accountof the lower pressure therein. I claim as my invention:

1.' A device of the character described,

- comprising, a pistonchamber havinginlet and discharge openings, a' piston and piston rod adapted to reciprocate in the pistonchamber, a cooling chamber adjacent the piston chamber in which the piston rod moves, an inletfor introducing cooling hquid under pressure to the cooling chamber, an outlet from said cooling chamber and automatically operated means for maintaining the out- -let open duringv the forward stroke of the .piston andfor maintaining the outlet closed during the return stroke.

2. A device, of' the character described, comprising; a piston chamber havinginlet and dischar e openings, apiston and piston rod adapte to'reciprocat'e inthe piston chamber, a cooling chamber adjacent the piston chamber in which the pistonfrod moves, an inlet for introducing coolin liquid under pressure'to the cooling cham er, an outlet from said cooling chamber, a check .valve in said inlet, a valve in said outlet, and

' automatically operated means for maintaining the outlet open during the forward stroke ofthe piston and for maintaining the outlet closed during the return stroke.

- I 3. A method for cooling the piston rod and packing joints of a pump for hotliquids;

which consists in introducing a cooling medium toacoolmg zone surroundlng the piston rod and in communication with the packthe cooling medium from the cooling zone' ing jointsof the pump, in discharging the cooling medium from the cooling zone during the forward stroke ofthe piston pump and preventing the passage of a substantial amount of cooling medium into the pump cylinder, in precluding the normal escape of with each return stroke of the pump piston, to maintain a substantially balanced pressure between the cooling zone and the pump cylinder, during both the suction and compression-strokes' ofthd piston.

- 4'. A method *for'coolm the piston rod of a pump'for hot liquids, w ich consists in introducing a cooling medium to a cooling zone surrounding the piston rod of the pump, in

discharging the cooling medium from the cooling zone-duringg the forward stroke of the piston pump, i'riprecluding the normal escapeof the cooling medium from -t-lie cooling zone with each return strokiof the pump piston,'to maintain a substantially balanced pressure between'the cooling zone and the pump cylinder during both the suction and compression strokes of the pump plston and during strokes preventing the passage of ing medium ihto the pump cylinder.

5. A method for cooling-the piston rod and associated packing'of a pump, which consists in forcing a portion of the material passed through the pump underthe pressure imparted thereto by the pump through a cooling zone in communication with the parts to be cooled.

6. A'method for cooling the piston rod a substantial amount of cooland associated packing of apump, which consists in forcing aportion of the materialpassed through the pump under the pressure imparted thereto by the pump through a cooling zone in communication with the parts -to be cooled, and in returning the material, subsequent to its passage through said cooling zone, to the inlet of the pump.

7. A method for cooling the piston rod and associated packing of a pump, which consists in intermittently admitting a portion'of the material discharged from the pump and under the pressure imparted thereto by the pump to a cooling zoneein communication with the parts to be cooled- 8. A method for cooling the piston rod and associated packing of a pump, which consists inintermittently admitting a portion ofthe material discharged from the ump and :under the pressure imparted t ereto by the pump to a cooling zone in communication with the parts to be cooled, and in controlling the dischargeof the material from the cooling zone by the stroke of the pump piston.

. 9. A method for cooling the piston rod of I a pump for hot liquids, which consists in passing a portion oft-he hot liquid discharged from the pump under the pressureimparted thereto by the pump through a cooling zone,

from which the liquid, at a relatively low tem? perature, is conveyed through a zone, surrounding the piston rod, to lower the temperature thereof.

comprising in combination, a piston-cha n'- ber having inlet and discharge openings, a

piston and piston rod, adapted to reciprocate in, said piston chamber, a cooling chamber, adjacent the piston chamber, in which the piston rod moves, means for conveyin a portionof the liquid which has passed t rough I the pump under-the pressure imparted thereto by the pump to said cooling chamber.

11. A device of the character described, comprising in combination, a piston chamber having inlet and discharge'openings, a piston and piston rod, adapted to reciprocate in said 'piston chamber, a cooling chamber,

adjacent' the piston chamber,in which the.

piston' r'od moves, means forconve'ying a po'rtion of thejliquid which has passed through the pump under" the pressure imparted thereto by the pump to said cooling chamber, an

no ,10. A device of the character described,

outlet from said cooling chamber, and means,v operated by the stroke of the piston, for openmg and closing said outlet.

I 12. A device as specified in claim 1 further characterized in that said automatically operated means is adapted to close said outlet at the end of the forward stroke of the piston and to open said outlet at the end of the return stroke of the iston.

13. A device as speci ed in claim 2 fur ther characterizedin that said automatically operated means is ada ted .to close -said outlet at the end of the orward stroke of the piston and to open said outlet at the end of the I return stroke of the piston.

' LYMAN C. 

